Kaposi's sarcoma (KS; pronounced kuh-PO-seez sar-KO-muh) is a very rare form of cancer (see cancer entry). The word "sarcom" refers to any form of cancer that affects muscle, bone, liver, kidneys, lungs, spleen, bladder, and other organs and tissues.

Learning disorders are academic problems experienced by children and adults of average to above-average intelligence. Learning disorders involve problems with reading, writing, mathematics, or a combination of these three skills.

Lupus is a disease in which a person's immune system attacks the body's own organs and tissues (see autoimmune disorders entry). The complete medical name for lupus is systemic lupus erythematosus (SLE; pronounced LOO-puhs er-uh-THEM-uh-tuhs).

Mental retardation is a developmental disability that is marked by lower-than-normal intelligence and limited daily living skills. Mental retardation is normally present at birth or develops early in life.

Multiple sclerosis (MS; pronounced multiple skluh-RO-siss) is a chronic autoimmune disorder (see autoimmune disorders entry) that affects the nerves. "Chronic" means that it develops slowly over time; "autoimmune" means that the body's immune system becomes confused about some part of the body it is designed to protect.

The word "osteoporosis" literally means "porous bones." Osteoporosis (pronounced OSS-tee-o-puh-RO-sis) occurs when bones begin to lose some of their essential elements. The most important of these elements is calcium.

Panic disorder is a condition in which a person feels sudden over-whelming fright, usually without any reasonable cause. A panic attack is generally accompanied by physical symptoms, such as a pounding heart, sweating, and rapid breathing.

Posttraumatic stress disorder (PTSD) is a condition that affects people who have gone through a major traumatic (shocking) event. PTSD is characterized by repeated thoughts about the ordeal, a dulling of emotions, an increased tendency to become excited and aroused, and, sometimes, dramatic personality changes.

Prostate cancer is a disease in which the cells of the prostate become abnormal. They start to grow uncontrollably, forming tumors.

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